Cheyenne, WA
Cheyenne Water Distribution System
Scope/Solutions
The water distribution system in Cheyenne includes four prestressed concrete cylinder pipelines (PCCP), approximately 13.5 mi long. The 16 to 30 in. dia., lined-cylinder pipes (LCP) were installed between 1950 and 1962. Three of the PCCP carry raw and treated water, and the fourth is a part of the distribution system. SGH assessed the condition of all four lines while they remained in service.
Highlights of SGH’s work include the following:
- Data collection and review of historical records
- Corrosion survey including electromagnetic conductivity testing
- Geotechnical and groundwater investigations
- External test-pit inspection of pipe
- Testing of mortar coating and prestressing wire samples
- Hydraulic transient analysis
- Structural evaluation of LCP
- Failure risk analysis of pipe assuming broken prestressing wires and corroded steel cylinder
We found that the lines had performed well, and there were no systematic factors that presented a significant risk of future failure.
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Project Summary
2003
Completion Date
Solutions
Repair & Rehabilitation
Services
Advanced Analysis | Applied Science & Research
Markets
Infrastructure & Transportation
Client(s)
Cheyenne Board of Public Utilities
Specialized Capabilities
Buried Infrastructure | Risk & Resilience Assessment | Materials Science
Key team members
Additional Projects
West
Sacramento Valley Station
SGH performed seismic/structural and facade assessments prior to the City’s acquisition of the buildings. Following the acquisition, SGH designed a structural retrofit, renovation, and exterior enclosure rehabilitation conforming to the Secretary of the Interior’s Standards for Rehabilitation.
West
Seismic Retrofit of Marine Terminal
SGH was the engineer of record for the seismic retrofit design of two 450 ft long wharf structures that required strengthening to comply with the MOTEMS seismic performance standards for marine oil terminals in the state.